Index: trunk/src/org/openstreetmap/josm/data/cache/JCSCachedTileLoaderJob.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/cache/JCSCachedTileLoaderJob.java	(revision 19531)
+++ trunk/src/org/openstreetmap/josm/data/cache/JCSCachedTileLoaderJob.java	(revision 19533)
@@ -394,5 +394,7 @@
                 byte[] raw;
                 if (urlConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
-                    raw = urlConn.getContent().readAllBytes();
+                    try (InputStream is = urlConn.getContent()) {
+                        raw = is.readAllBytes();
+                    }
                 } else {
                     raw = new byte[]{};